Which number should be multiples to obtain 165^2-123^2

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

Which of the following statement about pascal's triangle are true?

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?